mv

Move or rename files or directories.

SYNTAX
mv [options]... SourceDest
mv [options]... Source... Directory

If the last argument names an existing directory, `mv' moves each other given
file into a file with the same name in that directory. Otherwise, if only two
files are given, it renames the first as the second. It is an error if the last
argument is not a directory and more than two files are given.

OPTIONS
-b
--backup
Make a backup of each file that would otherwise be overwritten or
removed.
-f
--force
Remove existing destination files and never prompt the user.
-i
--interactive
Prompt whether to overwrite each existing destination file,
regardless of its permissions. If the response does not begin
with `y' or `Y', the file is skipped.
-S SUFFIX
--suffix=SUFFIX
Append SUFFIX to each backup file made with `-b'.
The backup suffix is ~, unless set with SIMPLE_BACKUP_SUFFIX.
-u
--update
Do not move a nondirectory that has an existing destination with
the same or newer modification time.
-v
--verbose
Print the name of each file before moving it.
-V METHOD
--version-control=METHOD'
Change the type of backups made with `-b'. METHOD can be:
t, numbered make numbered backups
nil, existing numbered if numbered backups exist, simple otherwise
never, simple always make simple backups
--help display help and exit
--version output version information and exit

Rename files that end with 'copy.txt' to just .txt
this demonstrates bash shell parameter expansion${parameter/pattern/string}
for f in *copy.html; do mv "$f" "${f/copy.txt/.txt}";done

`mv' can move only regular files across filesystems.

If a destination file exists but is normally unwritable, standard input is a terminal, and the `-f' or `--force' option is not given, `mv' prompts the user for whether to replace the file. (You might own the file, or have write permission on its directory.) If the response does not begin with `y' or `Y', the file is skipped.

“Any intelligent fool can make things bigger and more complex... It takes a touch of genius - and a lot of courage to move in the opposite direction” ~
Albert Einstein

Related:

cp - Copy one or more files to another locationmmv - Mass Move and rename
Equivalent Windows command:
MOVE - Move files from one folder to another